冬氨酸二丁二酸醚(AES)诱导黑麦草提取污染土壤重金属的效应

赵中秋; 席梅竹; 降光宇; 黄益宗; 白中科

中国地质大学(北京)土地科学技术学院, 北京, 100083;

中国科学院生态环境研究中心土壤环境研究室, 北京, 100085;

国土资源部土地整治重点实验室, 北京, 100035

基金项目:

教育部科学技术重点项目(109036)

国家自然科学基金(20807039)

“十一五”国家科技支撑计划项目(2008BAB38B07)

THE POTENTIAL OF NEW BIODEGRADABLE CHELATOR AES FOR PHYTOEXTRACTION OF HEAVY METALS IN CONTAMINATED SOILS

School of Land Science and Technology, China University of Geosciences, Beijing, 100083, China;

Department of Soil Environmental Sciences, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

Key Laboratory of Land Consolidation and Rehabilitation, the Ministry of Land and Resources, Beijing, 100035, China

Fund Project:

摘要: 采用盆栽试验,研究新型生物可降解螯合剂冬氨酸二丁二酸醚(AES)和非降解螯合剂乙二胺四乙酸(EDTA)调控下黑麦草修复重金属污染土壤的效应.黑麦草于含2500mgPb·kg-1,500mgCu·kg-1,1000mgZn·kg-1和15mgCd·kg-1的土壤中生长45d后,分别施加5mmol·kg-1土的AES或EDTA.结果表明,AES和EDTA可以显著提高土壤溶液和黑麦草植株地上部Pb、Zn、Cu和Cd的浓度.EDTA对土壤中Pb的溶解能力和对黑麦草积累重金属的促进作用显著强于AES,前者处理的土壤中水提取态Pb浓度和黑麦草地上部Pb浓度分别达到了15.9mg·kg-1和174.1mg·kg-1,显著高于AES处理的2.6mg·kg-1和44.0mg·kg-1.但AES对黑麦草积累Zn和Cd的促进作用较EDTA明显增强,黑麦草地上部Zn浓度达到了1081.8mg·kg-1,显著高于EDTA的776.7mg·kg-1和对照的389.6mg·kg-1;地上部Cd浓度为1.57mg·kg-1,高于EDTA的1.06mg·kg-1和对照的0.69mg·kg-1.与对照相比,AES和EDTA对Cu在土壤中的溶解和黑麦草植株中的积累亦有显著的促进作用,但二者处理无极显著差异.结果表明,生物可降解螯合剂AES在诱导植物修复重金属污染土壤尤其是Zn、Cd污染土壤中有很大的应用潜力,且与EDTA相比,环境风险大大降低.

Abstract: To study the effects of new biodegradable chelator AES(aspartic acid diethoxvsuccinate)and non-degradable chelating agent EDTA(ethylenediaminetetraacetic acid)on the extraction of Pb,Zn,Cu and Cd by ryegrass(Lolium perenne)from contaminated soil,a pot experiment was conducted.The results showed that,addition of 5 mmol·kg-1AES or EDTA can significantly improve Pb,Zn,Cu and Cd concentrations in soil solution and ryegrass plants shoots.EDTA was more effective than AES on the soil Pb dissolving and the enhancement of Pb accumulation by ryegrass.Under EDTA treatment,the water extractable Pb concentration in soil and the shoot Pb concentration of ryegrass reached 15.9 mg·kg-1 and 174.1 mg·kg-1,significantly higher than thatunder AES treatment which were 2.6 mg·kg-1 and 44.0 mg·kg-1 respectively.In terms of Zn and Cd,however,AES was more effective,shoot Zn concentration by AES addition reached 1081.8 mg·kg-1,significantly higher than those of EDTA(776.7 mg·kg-1)and the control(389.6 mg·kg-1),and shoot Cd concentration was 1.57mg·kg-1,higher than EDTA(1.06 mg·kg-1)and the control(0.69 mg·kg-1).Compared to the control,both EDTA and AES enhanced Cu dissolution in soil and accumulation by ryegrass shoots,but there was no significant difference between the two chelators.These results indicated that the biodegradable chelator AES was a potential alternative of non-biodegradable chelators such as EDTA,especially for Zn and Cd-contaminated soils,with reduced environmental risk.

Key words:

冬氨酸二丁二酸醚(AES)诱导黑麦草提取污染土壤重金属的效应

1. 中国地质大学(北京)土地科学技术学院, 北京, 100083;

2. 中国科学院生态环境研究中心土壤环境研究室, 北京, 100085;

3. 国土资源部土地整治重点实验室, 北京, 100035

收稿日期: 2009-05-22

基金项目:

教育部科学技术重点项目(109036)

国家自然科学基金(20807039)

“十一五”国家科技支撑计划项目(2008BAB38B07)

关键词:

可降解螯合剂 /
AES /
EDTA /
植物提取 /
黑麦草

THE POTENTIAL OF NEW BIODEGRADABLE CHELATOR AES FOR PHYTOEXTRACTION OF HEAVY METALS IN CONTAMINATED SOILS

1. School of Land Science and Technology, China University of Geosciences, Beijing, 100083, China;

2. Department of Soil Environmental Sciences, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

3. Key Laboratory of Land Consolidation and Rehabilitation, the Ministry of Land and Resources, Beijing, 100035, China

Received Date: 2009-05-22

Fund Project:

Keywords:

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